A 10.5" 300 blackout upper featuring Hardened Arm's New Scorpion 10" free float handguard. A strong but light weight 6061-T6 handguard with a continuous top rail and dual lock up feature. Perfect for use on an AR pistol or at home on a NFA short barreled rifle, smooth on the hands but capable of mounting Magpul MOE rail sections for all your AR accessories.

AR15 300 Blackout Pistol Upper Receiver Assembly:

Hardened Arms M4 Feed Ramp Flat Top Receiver

Black anodized mil-spec finished upper receiver

Feed ramps for increased feeding reliability on barrel and upper

Laser etched T-Marked upper receiver

Chrome Moly .300 Blackout High End Barrel

Black Mag-Phos Finish

Chambered in .300 Blackout

10.5" HBAR Profile barrel with M4 Extension

.750" barrel diameter at gas block

5/8x24 threaded muzzle/barrel

Low profile gas block

Barrel dimpled to secure gas block

Pistol length gas system

A2 flash hider

10" Hardened Arms Scorpion Free Float Rail

Fits any mil-spec AR15 lower receiver.

Hardened Arms uppers are high end, accurate, head spaced, inspected and test fired prior to shipping. They are built using stringent specs, top quality parts and procedures to ensure maximum reliability and performance.

You are responsible for knowing your state laws regarding barrel lengths, pistol, Short barreled rife restrictions. 20% restocking fees if you can not take delivery due to state restriction. Dealer programs are available on our website. Two year warranty against manufacturer defects. Finishes will wear with use, no warranties apply to finish wear.